Carburetor for explosion engines



Patented Mar. 16, 1943 CARBURETOR FOR EXPLOSION ENGINES Julius Fuchs, Cleveland, Ohio, assignor of fortyfive percent to Jacob Verhun, Cleveland, Ohio Application July 3, 1941, Serial No. 400,948

1 Claim.

The present invention relates to carburetors, and more particularly, to those of the type gen erally employed on automobile and aeronautical motors.

The object of my invention is to provide an eflicient and compact carburetor of this type, having an automatic means adapted to impart a whirling motion to the fuel mixture to promote vaporization thereof incorporated therein, whereby the liquid fuel particles in the fuel mixture will be uniformly distributed around the perimeter of the intake manifold in the proximity to to said means while passing thereby.

A still further object of my invention is to provide a device which is simple of construction, and can be readily manufactured, and which can be readily assembled or taken apart for inspection and repairs.

The invention and its aims and objects will be clearly understood from the following description, taken in connection with the accompanying drawing, of one embodiment of the invention herein given for illustrative purposes, the true scope of the invention being more fully pointed out in the appended claim.

Similar numerals refer to similar parts throughout the several views.

Figure 1 is a vertical semi-sectional view of the carburetor. The manifold is shown fragmentary.

Figure 2 is a rear View of the carburetor showing the float chamber, and a partial vertical section taken centrally of the carburetor and the upper portion of the manifold, showing the location of the means adapted to impart a whirling motion to the fuel mixture.

Figure 3 is a plan view of the carburetor.

Figure 4 is a plan view of a portion of the carburetor showing the relation of the lever that is employed to actuate the control valve member in the device.

Referring to the drawing there is shown a carburetor assembly comprising a constant level fuel chamber l having a fioat ll of suitable configuration therein. l 2 is a connection for the main fuel feed line (not shown). The connection is provided with a float-operated needle valve l 3. A hollow venting tube I4 is provided in the removably mounted cap l5 of the fuel chamber. The atmosphere enters the tube via an air vent or orifice It in the tube, and its entry is controlled by means of a screw threaded needle valve ll. The venting orifice I 6 in the vent tube should be positioned at a point high enough above the top surface l8 of the cap of the fuel chamber to prevent the escape of liquid therethrough, if the carburetor is used on an automobile, in going down or up a hill, or in ascending or diving if the carburetor is to be used on an aeroplane motor.

The fuel leaves the fuel chamber by means of a conduit [9 that extends vertically downwards and communicates with the longitudinally extending conduit 20 which communicates with the vertically extending conduit or well 2| which supplies the horizontally extending nozzle 22 that terminates in the vapor tube 23 in the mixing chamber 24 of the carburetor. The flow of the fuel from the chamber may be controlled by means of a threaded needle valve 25. The atmosphere enters the well '2I via an air vent or orifice 26 and is regulated by means of a needle valve 27. The air vent may be supplied with a wire filter screen or gauze, if the vent is of considerable dimension (wire gauze not shown).

The fuel nozzle terminates in the hollow cylindrical shaped primary mixture forming tube 23 which is open at the top and bottom. The aforesaid tube is concentrically positioned in the mixing chamber and is supported therein by means of ribs 28 apertured as at 29.

Extending diametrically across the mixing chamber above the primary mixture forming tube there is provided a supporting member 30 which supports the shaft 3| which extends perpendicularly downward through the center of the primary mixture forming tube and the body of the carburetor and into the upper portion of the manifold 32.

On this shaft there is mounted a rotatable axially movable control valve member 33. The control valve member is adapted to control the volume of the fuel flow. The control valve member tapers upward and downward so that it may be said to represent two truncated conical portions reversely arranged or base to base as at 34 and 35. Integrally formed with the upper portion 34 there is provided a cylindrically shaped neck portion 36 terminating in a projecting flange 31. The flange 31 cooperates with the primary mixture forming tube 23, thereby restricting a small portion of the primary mixture forming tube, and hence the volume of the flow of the fuel passing into the manifold member.

Below the control valve member there is mounted on the shaft a means adapted to impart a whirling motion to the fuel mixture 38. This member is rotatably mounted on the shaft in anti-friction bearings (anti-friction bearings not shown), and is rifled as at 39, or it may be otherwise suitably designed to break up the fuel passing thereagainst into a thin mist upon being rotated in the manifold by the passing of the fuel thereagainst on its way to the motor.

In the body of the carburetor there is mounted a transverse shaft 40, journalled in the bosses 4| and 42 formed integrally with the body of the carburetor. The end 43 of the shaft extends ample beyond the boss to receive the control valve operating lever 44 which is fast on the shaft. On the body of the carburetor there is provided a lug 45 as a stop against which the adjusting screw 45 in the lever engages when regulating the valve, and also in the manual operation of the valve while in use.

Fast on the transverse shaft there is mounted a bifurcated lever 41 having a cam face as at 48. The cylindrical neck 36 of the control valve member is mounted in the furcations, and the cam face thereof engages the underside 49 of the projecting flange 31. The operating lever and its cooperating cam lever is employed to operate and control the control valve member. The weight of the control valve member keeps it in contact with the cam face of the bifurcated or forked lever.

The body of the carburetor is so constructed that it forms a venturi 50 which is in communication with the mixing chamber and the upper end of the manifold 32. The upper portion 5| of the venturi forms a seat for the control valve member when brought into contactual pressure therewith. The movement of the control valve member controls the cross section of the fuel passage past the control valve member so that it provides a means to control and direct the fuel in varying ratios into the manifold passage where the means adapted to impart a whirling motion to the fuel mixture exerts an influence upon it in passing.

In operation, the suction of the motor, is intensified by the combination of the venturi and the control valve member. By increasing the space between the venturi and the valve member, the mixture is enriched, while idling the motor or running at low speed the cross section of the air passage past the venturi and the valve is decreased so that the suction of the motor is cut down. When the motor is accelerated, the valve is slightly open and is raised to increase the speed of the motor.

I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof; and I therefore desire that the present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

I claim:

In a carburetor the combination of a casing, a manifold, an integrally formed venturi in the casing, a vertically, arranged mixing chamber above the venturi, a vertically arranged primary mixture forming tube concentrically arranged in the aforesaid mixing chamber and supported by apertured ribs therein, a horizontally extending fuel nozzle terminating in the primary mixture forming tube and discharging thereinto, a fuel chamber having a duct for conducting fuel therefrom to the fuel nozzle, a support in the mixing chamber positioned above the vertically arranged primary mixture forming tube, a shaft connected to the supoprt and projecting perpendicularly downward through the vertically arranged mixing chamber, the vertically arranged primary mixture forming tube and the venturi and terminating in the upper portion of the manifold, a slidably mounted control valve member mounted on the shaft, a flange on the upper end of the aforesaid control valve member and below the primary mixture forming tube and cooperating with the primary mixture forming tube and adapted to restrict a small portion of the mixing chamber to control the volume of the flow of fuel, the slidably mounted control valve member cooperating with the venturi which forms a valve seat therefor, a lever cooperating with the control valve member and adapted to manually control the control valve member, and a rifled member rotatably mounted on the shaft below the control valve member and the venturi and in the upper part of the manifold and adapted to cause a whirling of the fuel mixture in the manifold to promote vaporization thereof.

JULIUS FUCHS. 

